I woke up yesterday and found all this black material under my testicles. what is this. is it an std? as soon as i scrape it off it returns hours later! help

Have you considered taking a shower and changing your underwear?

Dingle berries...

Does it have an odor? This could tell us whether it's a sanitary issue or perhaps way too much coffee.

Check to make sure that it's not your underwear rubbing off on the bottom of your scrotum.

It could be rectal bleeding . . . . . usually nothing to worry about if that is the case! It's the only thing I can think of. If you participate in anal sex and you are a little too active you might not be letting the sphincter relax back into its normal state, which with other factors could mean that you are leaking fecal matter which is accumulating throughout your pelvic region. Always best to see a doctor

As Xittenn says, (amongst other things!) get yourself to a doctor if this happens again. That said, do not panic.